dropshot_api_manager/

environment.rs

// Copyright 2025 Oxide Computer Company

//! Describes the environment the command is running in, and particularly where
//! different sets of specifications are loaded from

use crate::{
    apis::ManagedApis,
    git::GitRevision,
    output::{
        Styles,
        headers::{GENERATING, HEADER_WIDTH},
    },
    spec_files_blessed::{BlessedApiSpecFile, BlessedFiles},
    spec_files_generated::GeneratedFiles,
    spec_files_generic::ApiSpecFilesBuilder,
    spec_files_local::{LocalFiles, walk_local_directory},
};
use anyhow::Context;
use camino::{Utf8Component, Utf8Path, Utf8PathBuf};
use owo_colors::OwoColorize;

/// Configuration for the Dropshot API manager.
///
/// This struct describes various properties of the environment the API manager
/// is running within, such as the command to invoke the OpenAPI manager, and
/// the repository root directory. For the full list of properties, see the
/// methods on this struct.
#[derive(Clone, Debug)]
pub struct Environment {
    /// The command to run the OpenAPI manager.
    pub(crate) command: String,

    /// Path to the root of this repository
    pub(crate) repo_root: Utf8PathBuf,

    /// The default OpenAPI directory.
    pub(crate) default_openapi_dir: Utf8PathBuf,

    /// The default Git upstream.
    pub(crate) default_git_branch: String,
}

impl Environment {
    /// Creates a new environment with:
    ///
    /// * the command to invoke the OpenAPI manager (e.g. `"cargo openapi"`
    ///   or `"cargo xtask openapi"`)
    /// * the provided Git repository root
    /// * the default OpenAPI directory as a relative path within the
    ///   repository root
    ///
    /// Returns an error if `repo_root` is not an absolute path or
    /// `default_openapi_dir` is not a relative path.
    pub fn new(
        command: impl Into<String>,
        repo_root: impl Into<Utf8PathBuf>,
        default_openapi_dir: impl Into<Utf8PathBuf>,
    ) -> anyhow::Result<Self> {
        let command = command.into();
        let repo_root = repo_root.into();
        let default_openapi_dir = default_openapi_dir.into();

        if !repo_root.is_absolute() {
            return Err(anyhow::anyhow!(
                "repo_root must be an absolute path, found: {}",
                repo_root
            ));
        }

        if !is_normal_relative(&default_openapi_dir) {
            return Err(anyhow::anyhow!(
                "default_openapi_dir must be a relative path with \
                 normal components, found: {}",
                default_openapi_dir
            ));
        }

        Ok(Self {
            repo_root,
            default_openapi_dir,
            default_git_branch: "origin/main".to_owned(),
            command,
        })
    }

    /// Sets the default Git upstream and branch name.
    ///
    /// By default, this is `origin/main`, but it can be set to any valid Git
    /// remote and branch name separated by a forward slash, e.g.
    /// `origin/master` or `upstream/dev`.
    ///
    /// For individual commands, this can be overridden through the
    /// `--blessed-from-git` argument, or the `OPENAPI_MGR_BLESSED_FROM_GIT`
    /// environment variable.
    pub fn with_default_git_branch(
        mut self,
        branch: impl Into<String>,
    ) -> Self {
        self.default_git_branch = branch.into();
        self
    }

    pub(crate) fn resolve(
        &self,
        openapi_dir: Option<Utf8PathBuf>,
    ) -> anyhow::Result<ResolvedEnv> {
        // This is a bit tricky:
        //
        // * if the openapi_dir is provided:
        //   * first we determine the absolute path using `camino::absolute_utf8`
        //   * then we determine the path relative to the workspace root (erroring
        //     out if it is not a subdirectory)
        // * if the openapi_dir is not provided, we use default_openapi_dir as
        //   the relative directory, then join it with the workspace root to
        //   obtain the absolute directory.
        let (abs_dir, rel_dir) = match &openapi_dir {
            Some(provided_dir) => {
                // Determine the absolute path.
                let abs_dir = camino::absolute_utf8(provided_dir)
                    .with_context(|| {
                        format!(
                            "error making provided OpenAPI directory \
                             absolute: {}",
                            provided_dir
                        )
                    })?;

                // Determine the path relative to the workspace root.
                let rel_dir = abs_dir
                    .strip_prefix(&self.repo_root)
                    .with_context(|| {
                        format!(
                            "provided OpenAPI directory {} is not a \
                             subdirectory of repository root {}",
                            abs_dir, self.repo_root
                        )
                    })?
                    .to_path_buf();

                (abs_dir, rel_dir)
            }
            None => {
                let rel_dir = self.default_openapi_dir.clone();
                let abs_dir = self.repo_root.join(&rel_dir);
                (abs_dir, rel_dir)
            }
        };

        Ok(ResolvedEnv {
            command: self.command.clone(),
            repo_root: self.repo_root.clone(),
            local_source: LocalSource::Directory { abs_dir, rel_dir },
            default_git_branch: self.default_git_branch.clone(),
        })
    }
}

fn is_normal_relative(default_openapi_dir: &Utf8Path) -> bool {
    default_openapi_dir
        .components()
        .all(|c| matches!(c, Utf8Component::Normal(_) | Utf8Component::CurDir))
}

/// Internal type for the environment where the OpenAPI directory is known.
#[derive(Debug)]
pub(crate) struct ResolvedEnv {
    pub(crate) command: String,
    pub(crate) repo_root: Utf8PathBuf,
    pub(crate) local_source: LocalSource,
    pub(crate) default_git_branch: String,
}

impl ResolvedEnv {
    pub(crate) fn openapi_abs_dir(&self) -> &Utf8Path {
        match &self.local_source {
            LocalSource::Directory { abs_dir, .. } => abs_dir,
        }
    }

    pub(crate) fn openapi_rel_dir(&self) -> &Utf8Path {
        match &self.local_source {
            LocalSource::Directory { rel_dir, .. } => rel_dir,
        }
    }
}

/// Specifies where to find blessed OpenAPI documents (the ones that are
/// considered immutable because they've been committed-to upstream)
#[derive(Debug)]
pub enum BlessedSource {
    /// Blessed OpenAPI documents come from the Git merge base between `HEAD`
    /// and the specified revision (default "main"), in the specified directory.
    GitRevisionMergeBase { revision: GitRevision, directory: Utf8PathBuf },

    /// Blessed OpenAPI documents come from this directory
    ///
    /// This is basically just for testing and debugging this tool.
    Directory { local_directory: Utf8PathBuf },
}

impl BlessedSource {
    /// Load the blessed OpenAPI documents
    pub fn load(
        &self,
        apis: &ManagedApis,
        styles: &Styles,
    ) -> anyhow::Result<(BlessedFiles, ErrorAccumulator)> {
        let mut errors = ErrorAccumulator::new();
        match self {
            BlessedSource::Directory { local_directory } => {
                eprintln!(
                    "{:>HEADER_WIDTH$} blessed OpenAPI documents from {:?}",
                    "Loading".style(styles.success_header),
                    local_directory,
                );
                let api_files: ApiSpecFilesBuilder<'_, BlessedApiSpecFile> =
                    walk_local_directory(local_directory, apis, &mut errors)?;
                Ok((BlessedFiles::from(api_files), errors))
            }
            BlessedSource::GitRevisionMergeBase { revision, directory } => {
                eprintln!(
                    "{:>HEADER_WIDTH$} blessed OpenAPI documents from git \
                     revision {:?} path {:?}",
                    "Loading".style(styles.success_header),
                    revision,
                    directory
                );
                Ok((
                    BlessedFiles::load_from_git_parent_branch(
                        revision,
                        directory,
                        apis,
                        &mut errors,
                    )?,
                    errors,
                ))
            }
        }
    }
}

/// Specifies how to find generated OpenAPI documents
#[derive(Debug)]
pub enum GeneratedSource {
    /// Generate OpenAPI documents from the API implementation (default)
    Generated,

    /// Load "generated" OpenAPI documents from the specified directory
    ///
    /// This is basically just for testing and debugging this tool.
    Directory { local_directory: Utf8PathBuf },
}

impl GeneratedSource {
    /// Load the generated OpenAPI documents (i.e., generating them as needed)
    pub fn load(
        &self,
        apis: &ManagedApis,
        styles: &Styles,
    ) -> anyhow::Result<(GeneratedFiles, ErrorAccumulator)> {
        let mut errors = ErrorAccumulator::new();
        match self {
            GeneratedSource::Generated => {
                eprintln!(
                    "{:>HEADER_WIDTH$} OpenAPI documents from API \
                     definitions ... ",
                    GENERATING.style(styles.success_header)
                );
                Ok((GeneratedFiles::generate(apis, &mut errors)?, errors))
            }
            GeneratedSource::Directory { local_directory } => {
                eprintln!(
                    "{:>HEADER_WIDTH$} \"generated\" OpenAPI documents from \
                     {:?} ... ",
                    "Loading".style(styles.success_header),
                    local_directory,
                );
                let api_files =
                    walk_local_directory(local_directory, apis, &mut errors)?;
                Ok((GeneratedFiles::from(api_files), errors))
            }
        }
    }
}

/// Specifies where to find local OpenAPI documents
#[derive(Debug)]
pub enum LocalSource {
    /// Local OpenAPI documents come from this directory
    Directory {
        /// The absolute directory path.
        abs_dir: Utf8PathBuf,
        /// The directory path relative to the repo root. Used for Git commands
        /// that read contents of other commits.
        rel_dir: Utf8PathBuf,
    },
}

impl LocalSource {
    /// Load the local OpenAPI documents
    pub fn load(
        &self,
        apis: &ManagedApis,
        styles: &Styles,
    ) -> anyhow::Result<(LocalFiles, ErrorAccumulator)> {
        let mut errors = ErrorAccumulator::new();
        match self {
            LocalSource::Directory { abs_dir, .. } => {
                eprintln!(
                    "{:>HEADER_WIDTH$} local OpenAPI documents from \
                     {:?} ... ",
                    "Loading".style(styles.success_header),
                    abs_dir,
                );
                Ok((
                    LocalFiles::load_from_directory(
                        abs_dir,
                        apis,
                        &mut errors,
                    )?,
                    errors,
                ))
            }
        }
    }
}

/// Stores errors and warnings accumulated during loading
pub struct ErrorAccumulator {
    /// errors that reflect incorrectness or incompleteness of the loaded data
    errors: Vec<anyhow::Error>,
    /// problems that do not affect the correctness or completeness of the data
    warnings: Vec<anyhow::Error>,
}

impl ErrorAccumulator {
    pub fn new() -> ErrorAccumulator {
        ErrorAccumulator { errors: Vec::new(), warnings: Vec::new() }
    }

    /// Record an error
    pub fn error(&mut self, error: anyhow::Error) {
        self.errors.push(error);
    }

    /// Record a warning
    pub fn warning(&mut self, error: anyhow::Error) {
        self.warnings.push(error);
    }

    pub fn iter_errors(&self) -> impl Iterator<Item = &'_ anyhow::Error> + '_ {
        self.errors.iter()
    }

    pub fn iter_warnings(
        &self,
    ) -> impl Iterator<Item = &'_ anyhow::Error> + '_ {
        self.warnings.iter()
    }
}